Implementa sistema de chat em tempo real entre agente e cliente

- Adiciona tabela liveChatSessions no schema Convex
- Cria convex/liveChat.ts com mutations e queries para chat
- Adiciona API routes para maquinas (sessions, messages, poll)
- Cria modulo chat.rs no Tauri com ChatRuntime e polling
- Adiciona comandos de chat no lib.rs (start/stop polling, open/close window)
- Cria componentes React do chat widget (ChatWidget, types)
- Adiciona botao "Iniciar Chat" no dashboard (ticket-chat-panel)
- Implementa menu de chat no system tray
- Polling de 2 segundos para maior responsividade
- Janela de chat flutuante, frameless, always-on-top

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

convex/schema.ts

@@ -410,6 +410,31 @@ export default defineSchema({
     .index("by_ticket_created", ["ticketId", "createdAt"])
     .index("by_tenant_created", ["tenantId", "createdAt"]),
 
+  // Sessoes de chat ao vivo entre agente (dashboard) e cliente (Raven desktop)
+  liveChatSessions: defineTable({
+    tenantId: v.string(),
+    ticketId: v.id("tickets"),
+    machineId: v.id("machines"),
+    agentId: v.id("users"),
+    agentSnapshot: v.optional(
+      v.object({
+        name: v.string(),
+        email: v.optional(v.string()),
+        avatarUrl: v.optional(v.string()),
+      })
+    ),
+    status: v.string(), // ACTIVE | ENDED
+    startedAt: v.number(),
+    endedAt: v.optional(v.number()),
+    lastActivityAt: v.number(),
+    unreadByMachine: v.optional(v.number()),
+    unreadByAgent: v.optional(v.number()),
+  })
+    .index("by_ticket", ["ticketId"])
+    .index("by_machine_status", ["machineId", "status"])
+    .index("by_tenant_machine", ["tenantId", "machineId"])
+    .index("by_tenant_status", ["tenantId", "status"]),
+
   commentTemplates: defineTable({
     tenantId: v.string(),
     kind: v.optional(v.string()),